Be a little more verbose when loading cel_custom.conf.

Review: https://reviewboard.asterisk.org/r/2805/
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Merged revisions 398167 from http://svn.asterisk.org/svn/asterisk/branches/1.8


git-svn-id: http://svn.asterisk.org/svn/asterisk/branches/11@398168 f38db490-d61c-443f-a65b-d21fe96a405b